Phase transfer catalysis (PTC) is a process commonly used in organic chemistry reactions. This process involves transferring a reactant from one phase to another using a catalyst that can easily move between the two phases. There are several alternatives or synonyms for PTC, such as interphase catalysis, interfacial catalysis, and two-phase catalysis. Each of these terms describes the same process of facilitating the transfer of the reactant between two different phases. Interphase catalysis focuses on the interface between two phases, whereas interfacial catalysis emphasizes the interaction between the two phases. Two-phase catalysis is a broader term that encompasses any process that occurs in two separate phases. All in all, these synonyms emphasize the importance of the catalyst's ability to operate effectively between two different phases for driving reactions forward.